Comment 2 for bug 1789130

I just tried again on a fresh install, and noted this in syslog:

Aug 27 21:55:14 penguin systemd-timesyncd[904]: Network configuration changed, trying to establish connection.
Aug 27 21:55:14 penguin systemd[1]: Starting Load/Save RF Kill Switch Status...
Aug 27 21:55:14 penguin systemd-rfkill[9744]: Failed to open device rfkill0: No such device
Aug 27 21:55:14 penguin systemd[1]: Started Load/Save RF Kill Switch Status.
Aug 27 21:55:14 penguin systemd-timesyncd[904]: Synchronized to time server 91.189.91.157:123 (ntp.ubuntu.com).
Aug 27 21:55:14 penguin kernel: [24668.459650] iwlwifi 0000:03:00.0: can't disable ASPM; OS doesn't have ASPM control
Aug 27 21:55:14 penguin kernel: [24668.460729] iwlwifi 0000:03:00.0: loaded firmware version 18.168.6.1 op_mode iwldvm
Aug 27 21:55:14 penguin kernel: [24668.460758] iwlwifi 0000:03:00.0: CONFIG_IWLWIFI_DEBUG disabled
Aug 27 21:55:14 penguin kernel: [24668.460760] iwlwifi 0000:03:00.0: CONFIG_IWLWIFI_DEBUGFS enabled
Aug 27 21:55:14 penguin kernel: [24668.460761] iwlwifi 0000:03:00.0: CONFIG_IWLWIFI_DEVICE_TRACING enabled
Aug 27 21:55:14 penguin kernel: [24668.460764] iwlwifi 0000:03:00.0: Detected Intel(R) Centrino(R) Advanced-N 6205 AGN, REV=0xB0
Aug 27 21:55:14 penguin kernel: [24668.489358] ieee80211 phy1: Selected rate control algorithm 'iwl-agn-rs'
Aug 27 21:55:14 penguin systemd-udevd[9759]: link_config: autonegotiation is unset or enabled, the speed and duplex are not writable.
Aug 27 21:55:14 penguin kernel: [24668.492733] iwlwifi 0000:03:00.0 wlp3s0: renamed from wlan0
Aug 27 21:55:14 penguin systemd-networkd[922]: wlan0: Interface name change detected, wlan0 has been renamed to wlp3s0.
Aug 27 21:55:14 penguin systemd-timesyncd[904]: Network configuration changed, trying to establish connection.
Aug 27 21:55:14 penguin networkd-dispatcher[1123]: WARNING:Unknown index 4 seen, reloading interface list
Aug 27 21:55:14 penguin systemd-timesyncd[904]: Synchronized to time server 91.189.91.157:123 (ntp.ubuntu.com).
Aug 27 21:55:17 penguin ModemManager[9578]: <info> Couldn't check support for device at '/sys/devices/pci0000:00/0000:00:1c.1/0000:03:00.0': not supported by any plugin

That said, if I manually start NetworkManager afterwards, it appears to inherit network handling unproblematically without a reboot.